What does affix mean?
The definition of affix
Af*fix”, v. t.
[imp. & p. p. Affixed; p. pr. & vb. n. Affixing.]
Etym: [LL. affixare, L. affixus, p. p. of affigere to fasten to; ad + figere to fasten: cf. OE. affichen, F. afficher, ultimately fr. L. affigere. See Fix.]

1 To subjoin, annex, or add at the close or end; to append to; to fix to any part of; as, to affix a syllable to a word; to affix a seal to an instrument; to affix one’s name to a writing.
2 To fix or fasten in any way; to attach physically. Should they [caterpillars] affix them to the leaves of a plant improper for their food. Ray.
3 To attach, unite, or connect with; as, names affixed to ideas, or ideas affixed to things; to affix a stigma to a person; to affix ridicule or blame to any one.
4 To fix or fasten figuratively; — with on or upon; as, eyes affixed upon the ground. [Obs.] Spenser.

Synonyms
— To attach; subjoin; connect; annex; unite.

Af”fix, n.; pl. Affixes.
Etym: [L. affixus, p. p. of affigere: cf. F. affixe.]

That which is affixed; an appendage; esp. one or more letters or syllables added at the end of a word; a suffix; a postfix.